Waves

First of all pardon me about my poor english skill, not my native language. I know this is a silly question but I really don't have knowledge in signals and displays. I'm very limited with CPUs alone. I have this monitor that looks like getting some signal interferance (not so sure) with...

So i recently bought this PC it has a Core 2 Quad Q9650, 4 gigs of ddr3 2x2 and gtx 750 (Zotac) with Gigabyte G41M Combo and the monitor model is LG Flatron W2246 it has a VGA port which i'm using and the lines/waves pattern changes for some reason and i tried another monitor and same issue and...

So every time I play GTA, or render, I my computer freezes, and I have to restart it, once its restarted, it gives me the message "overclocking failed!" my 5960x is overclocked at 4.7ghz, I have tried to up the voltage to 1.36v, then 1.37v and that didn't work. The rest of my rig is in my signature.